TWICE WRONG DELIVERY

On the 9th of AUGUST 2022, a salesman from cell c called my mum who is a pensioner and whom currently has 3 contracts with cell c as a valued customer she is very disappointed in this recent service. He offered her laptop i5 for R499 a month on contract which she accepted. It was eventually delivered on the 16th of August, only after opening it it was the wrong laptop, it was a i3 instead of i5. The 17th of August she then called to complain, and they told her they will pick it up and replace it within 24 to 48hours. The 20th of August she then called again to notify them that the laptop was still not picked up and can she speak to one person on this matter as it's a long wait to get through to their line on 084145.They then said that its always going to be different people she has to speak to and that its going to take 24 to 48 hours for it to be picked up.my question is why?? 22nd called them again still not picked up' 25TH August rams corrier service picked up the laptop. 31st of August after no word she called cell c again to ask about the progress, They then told her that after it gets taken from Durban to Johannesburg store, they will deliver the right laptop to her i5 within a week. She explained her irritation and her need for the laptop which was for her grandchild to start work so it was urgent. 9th of September they delivered next laptop which was again the wrong laptopi3 instead of i5'as well as the box not being sealed. she called cell c again to complain, which again they said they will pick it up within 24 to 48 hours. 12th September she called again to say laptop isn't picked up yet and again same response 48hours. 13th September she drove to the cell c store in overpert city to get some help,they instead told her that they are separate to cell c mobile and that she must go home and call them again. She was by then very mad and exhausted with this back-and-forth situation, she then told them to cancel this contract with the laptop. Which they couldn't do. 19th September she called them 3 times to check when they are coming to pick it up.they said 24 to 48 hours.my mum then emailed them as she was worried about them billing her for this laptop, so she complained and explained everything, still no response.by now she had spoken to over 20 different people who always asked her to rate their service instead of helping her. 22nd September she called them again to tell them it's still not picked up. Currently the laptop hasn't being picked up still. And as her daughter I am furious at this disgusting service from cell c. a simple task like delivering the correct laptop chosen by the client cannot be done. And it seems like there is no order within cell c because nobody needs to answer to anyone. My mum is a pensioner and is using her petrol and lots of stress to get this matter sorted and still no Joy in replacing this laptop. They better not still bill her for their incompetence and lack of service!!!